Focusing polychromatic light through strongly scattering media
Optics
2016-12-21 v1
Abstract
We demonstrate feedback-optimized focusing of spatially coherent polychromatic light after transmission through strongly scattering media, and describe the relationship between optimized focus intensity and initial far-field speckle contrast. Optimization is performed using a MEMS spatial light modulator with camera-based or spectrometer-based feedback. We observe that the spectral bandwidth of the optimized focus depends on characteristics of the feedback signal. We interpret this dependence as a modification in the number of spectral modes transmitted by the sample, and introduce a simple model for polychromatic focus enhancement that is corroborated by experiment with calibrated samples.
Cite
@article{arxiv.1304.6674,
title = {Focusing polychromatic light through strongly scattering media},
author = {Hari P. Paudel and Chris Stockbridge and Jerome Mertz and Thomas Bifano},
journal= {arXiv preprint arXiv:1304.6674},
year = {2016}
}